Start/sit mistakes, by the numbers
Everyone has a story about the week they benched the wrong guy. We counted every one of them in a real league, for a whole season, to see how common those stories really are.
The numbers on this page come from one real 12-team Sleeper league, half PPR, across all 14 weeks of the 2025 regular season. That is 168 lineups in total. It is the same league shown in the sample report, with the managers and team names replaced by Team 1 to Team 12. The player names and points are real. Every figure was worked out by the same code that builds a live report, at the moment this page was published.
What counts as a mistake
A start/sit mistake here is one real, legal swap: a player on the bench who scored more than a player in the lineup, where moving him in would still leave a lineup Sleeper would accept. A running back cannot replace a quarterback, so a big quarterback week on the bench only counts against the quarterback slot. A wide receiver on the bench can replace a running back in a FLEX spot, so those swaps count.
Add up every mistake in a week and you get that team's bench tax: the gap between the points they scored and the most the same roster could have scored. The lineup efficiency guide explains how the best lineup is found. This page is about how often it goes wrong and by how much.
Almost nobody sets a perfect lineup
Out of 168 lineups, only 11 were perfect, about 7%. In every other week at least one bench player outscored someone who started. Across the whole league that added up to 336 wrong calls, roughly 2.0 per team per week.
That sounds harsh, but it is the normal state of fantasy football. Rosters carry five or six bench players precisely because nobody knows in advance who will have the big game. If you have two running backs of similar quality and start the wrong one, you made a reasonable call that happened to lose. The point of counting is not to shame anyone. It is to show that a bad week on the bench is common, and that the real question is how big the gap was.
How much a wrong call costs
The average wrong call cost 7.2 points. The median was 6.0, which means half of all mistakes were smaller than that. Most of the time, a start/sit mistake is the difference between a player scoring 9 and one scoring 15: annoying, but rarely the reason a game is lost.
The bigger ones are where games are decided. 88 calls, or 26% of all mistakes, cost 10 points or more on their own. These are the weeks people remember: the backup who got the goal-line work, the receiver whose quarterback finally found him, the starter who left in the first quarter.
Per team per week, the average bench tax was 14.4 points and the median was 12.5. Over the season the twelve teams left a combined 2424.4 points on their benches.
| Bench tax in a week | Lineups | Share |
|---|---|---|
| Perfect (0) | 11 | 7% |
| Under 5 | 24 | 14% |
| 5 to 10 | 30 | 18% |
| 10 to 20 | 49 | 29% |
| 20 or more | 54 | 32% |
The table shows the spread. A clean week with under five points left on the bench is less common than a week with twenty or more. That last group is large because one wrong call of ten-plus points, plus a couple of small ones, gets you there quickly.
The costliest calls of the season
The single most expensive decision of the year came in week 4: Team 8 left K. Gainwell on the bench for 28.4 points while A. Brown scored 1.7 in the lineup. That one swap was worth 26.7 points. Here are the biggest single calls in the league.
| Week | Team | Benched | Pts | Started | Pts | Cost |
|---|---|---|---|---|---|---|
| 4 | Team 8 | K. Gainwell | 28.4 | A. Brown | 1.7 | 26.7 |
| 4 | Team 3 | W. Marks | 25.9 | L. McConkey | 1.6 | 24.3 |
| 1 | Team 7 | Z. Flowers | 24.6 | J. Ford | 1.0 | 23.6 |
| 14 | Team 11 | B. Corum | 25.6 | K. Walker | 3.3 | 22.3 |
| 12 | Team 5 | D. Henry | 21.8 | K. Johnson | 0.0 | 21.8 |
| 7 | Team 12 | M. Stafford | 27.4 | C. Williams | 5.7 | 21.7 |
| 4 | Team 7 | J. Hill | 26.2 | R. Stevenson | 4.6 | 21.6 |
| 7 | Team 1 | O. Gadsden | 25.9 | M. Taylor | 4.6 | 21.3 |
Look at the "Started" column. Most of the damage comes from a starter who scored almost nothing, not from a bench player having a career game. A low-scoring starter is often an injury, a game script that went the wrong way, or a player who was a reasonable start until he was not. That is worth remembering before blaming yourself: a lot of these calls looked fine on Sunday morning.
Which weeks hurt most
Week 13 was the league's worst: 222.3 points left on benches across all twelve teams, and 3 games where the losing team's best lineup would have won. The cleanest was week 5, at 114.8 points and 0 flipped games.
| Week | League bench tax | Per team | Games a better lineup would have flipped |
|---|---|---|---|
| 1 | 194.1 | 16.2 | 2 |
| 2 | 185.0 | 15.4 | 2 |
| 3 | 154.5 | 12.9 | 1 |
| 4 | 221.9 | 18.5 | 1 |
| 5 | 114.8 | 9.6 | 0 |
| 6 | 159.5 | 13.3 | 1 |
| 7 | 177.5 | 14.8 | 2 |
| 8 | 159.4 | 13.3 | 1 |
| 9 | 150.4 | 12.5 | 0 |
| 10 | 135.0 | 11.2 | 2 |
| 11 | 208.9 | 17.4 | 2 |
| 12 | 149.9 | 12.5 | 2 |
| 13 | 222.3 | 18.5 | 3 |
| 14 | 191.3 | 15.9 | 2 |
Bad weeks tend to be weeks with surprises: injuries during games, backups who stepped in, and bye weeks that forced managers to start players they did not trust. Weeks with few surprises are the ones where the obvious lineup was also the right one. No week was clean for everyone.
What to take from it
- A perfect lineup is rare. If you set one, enjoy it, but do not expect to do it often.
- Most mistakes are small. The ones that matter are the ten-point swings, and those usually come from a starter who busted rather than a bench player who boomed.
- Hindsight is doing a lot of work in these numbers. They describe what happened, not what a manager could have known. Kickoff locks and late injury news also limit what was possible.
- A season's bench tax says more than any one week. One bad Sunday is luck. A season of large gaps is a pattern.
To see how these mistakes split across QB, RB, WR, TE, FLEX, kicker and defense, read which positions cause the most bench tax. To see how many of them actually decided games, read close games and lineup calls. And for every number worked out on one team's week, see the sample report.